Tuned oscillatory circuit



.F127 7 j 'f Aug. 11, 1942. s KocH E-AL n 2,292,880

` -TUNED OSGILLATORY GIRCUIfI V g Filed lay 17, 1941 INVEN ons ATTORNEY V made integral with the cover Patented nog. 11, 1942 2,292,880 TUNED OSCIILATORY CIRCUIT Siegfried Koch and.v Alfred Schmidt; Berlin, Germany, assignors to Telefunken Gesellschaft fr Drahtlose Telegraphie m. b. H., Berlin, Zehlendori', Germany, a corporation of Germany Application May`17, 1941, Serial No. 393,860 In Germany March 15, 1940 7 claims. (c1. 1784-744)` The invention relates to high frequency tuned oscillatory circuits comprising a casing and a condensor therein having a divided stator and a rotor supported by the cover and the bottom of the casing. With such oscillatory circuits it 1snecessary to change the rotor as soon as a fre' quency range between certain limits is attained.

In consequence thereof every oscillatory circuit had empirically to be adjusted on a suitable frequency range, which only can be done by eX- pensive work. To simplify said work and to save time it has already been proposed to provide al screw bolt in the wall of the casing of the oscillatory circuit and to adjust said screw against the condenser by longitudinal movement. In this way a variation of the mean wavelength of the oscillatory circuit can be effected, but at the same time the extension'of the frequency range is influenced disadvantageously.

According to the invention the new oscillatory Insidethe casing I near the bottom 3 a circular disc 8 isarranged in sucha way as to embrace the stator ofthe condenser or the inner tubular conductor of the oscillatory circuit. For this purpose the disc is provided with a central opening. The disc 8 may be movedl longitudinallyalong the axis of the oscillatory circuit or may be displaced in any other suitable way. Advantageously the disc is manufactured of ytwo parts hinged together by a `pivot 9 in -order'to allow the ,parts to be ti1ted.| Opposite the pivot 9 the end of each part 8 is provided with teeth I meshing with one another. The pivot 9 is supported by means of an insulated sleeve II arranged in a cap fastened to the wall ofthe casing I. The toothed ends I0 of the ring-shaped circuit is constructed in such a way that the Y mean wavelength and the extension of the range may be adjusted as far independentlyv from one another as possible by varying the in-` .be adjusted over against one another. The

movement of the disc is effected by means of a gear mechanism to be rotated by a knob mounted on the casing of the oscillatory circuit.

A more detailed specication follows in conjunction with the drawing, in which Fig. 1 is a cross section through the new oscillatory circuit, and

Fig. 2 is a longitudinal section.

The oscillatory circuit comprises al cylindrical casing I of metal having the coverA 2 and a bottom 3. Bearings, not shown, are arranged in the Acentre of the bottom and the cover to support a y shaft E for the rotor t cooperating with thestator comprising two parts, one of which is suitably part with the bottom 3. Both parts are divided by the interstice 'i o ditierent breadth as shown 2 and the other disc s are provided with studs I2 and I3 respectively mounted in a bearing I4 arranged opposite the sleeve II in an aperture of the wall of thel casing I and carried by a bridgepiece I6. Said bridge may be fastened to the casing by the intermediary of screw bolts I8 by which avremovable cap Il is mounted covering the aperture. The stud I3 is prolongated over the bridge and is provided with a slot for the insertion of a tool to adjust the position of the stud I3 the other end of which is keyed to the plate 8. -The bearing is isprovided with a clamping means for the purpose of locking the stud in the position. adjusted by means of a screw I5.

To adjust the two parts of the ring-shaped disc -the cap I'i is to be removed and the stud I3 is rotated in such a way as to tilt the parts of the disc to vary its effect on the oscillatory circuit. y

The adjusted position of the disc 8 can be xed by the clamping screw I5.

What we claim is:

I 1. A high frequency tuned oscillatory circuit comprising an outer conductor and an innerl tubular conductor composed of two spaced elements to form a condenser, a

of said disc from the zone of maximum current to the zone of maximum voltage.

2. A high frequency tuned oscillatory circuit comprising an outer conductor and an inner con ductor composed of two spaced coaxial elements;

a condenser the stator of which is formed bythe two elements of said inner conductor, a disc placed disc permanently mounted between the inner and outer conductors,4

between the outer and inner conductors and comprising two parts hinged to one another,-

'halves pivotally connected with one another and arranged in one position to be in the region of maximum current of said oscillatory circuit, the center of said disc lying on the common axis of said outer and inner conductors, and means for simultaneously varying the position of said parts from the zone of maximum current to the zone of maximum voltage. A

4. A high frequency tuned oscillatory circuit comprising an outer and an inner conductor, a.

bottom connecting said conductors vat the one end, a cover connecting the conductors at the .other end, a circular disc having a central opening and consisting of two halves pivotally connected with one another and arranged Vnear the Y bottom, the center cf said disc lyingl on the common axis of the outer and inner conductors, and means adapted to adjust the said disc and to x same in the position given.

5. A high frequency tuned oscillatory circuit comprising an `outer and an inner conductor, a condenser the statorvof which is formed by the inner conductor, a bottom and a cover connecting the ends of said conductors, and a ring? shaped disc placed near the bottom surrounding the, inner conductor and consisting' oi two halves hinged together by means of a pivot supported by the outer conductor, and gearing means for tilting the said halves about their common axis of separation and for ilxing same in the position given.

6. A high frequency tuned oscillator circuit comprising an outer conductor and an inner coaxial conductor, said inner conductor comprising two hollow spaced elements placed end to end on the same straight line, a rotatable element in the interiors of said two hollow spaced elements and capacitively coupled thereto to form a capacitor therewith, a disc located in the interior of 4said tuned circuit near the maximum current-minimum voltage end and having its center lying on the common axis of said outer and inner conductors, said disc being formed o! two pivotally arranged parts, and means for changing the angular position of said parts of said disc relative to each other for bringing them into the zone of maximum voltage.

7. An oscillatory system comprising a shield, an adjustable capacity disposed within said shield and connected to said shieldl by means of inductances in the :form of rods, said shield, inductances and capacity .forming a resonant tank circuit, and tuning means for said resonant tank circuit including two pivotally arranged parts angularlv movable relative to each other and located between said shield and adjustable capacity, said. pivotally arranged parts being mounted on one of said rods at a position of large current ow over said one rod.

f smGFRIED KOCH.

ALFRED scHMm'r. 

